1.5.9-1: socket() appears NOT to be thread-safe

["Enzo Michelangeli" <em@em.no-ip.com>]

While porting to Cygwin the Linux application "sipd"
(http://www.sxdesign.com/index.php?page=developer&submnu=sipd ), which
uses pthreads, I noticed that socket() calls issued concurrently by
several threads often failed, with strerror(errno) saying "operation not
permitted". Once I protected all the calls with mutex locks, such errors
went away. Is Cygwin's implementation of socket() known to be
thread-unsafe?

Enzo

P.S. I have written an implementation of the missing gethostbyname_r(),
based on a mutex-protected call to gethostbyname(). If useful, I may
gladly contribute the code.


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